<em>F</em><em>a</em><em>l</em><em>s</em><em>e</em><em>,</em><em> </em><em>y</em><em>o</em><em>u</em><em> </em><em>cannot</em><em> </em><em>control the heart </em><em>muscles</em><em> or its cells</em>
You can't control the heart muscle or its cells: they respond to the things our body needs, such as oxygen in our leg muscles as we move, or getting rid of our waste carbon dioxide by breathing out.
